Texas TI-86 用户手册

09PARA.DOC   TI-86, Chap 9, US English   Bob Fedorisko   Revised: 02/13/01 2:27 PM   Printed: 02/13/01 3:02 PM   Page 126 of 8

09PARA.DOC   TI-86, Chap 9, US English   Bob Fedorisko   Revised: 02/13/01 2:27 PM   Printed: 02/13/01 3:02 PM   Page 126 of 8

To display the mode screen, press - m. To graph parametric equations, you must
select 

 graphing mode before you enter equations, set the format, or edit window

variable values. The TI

-86 retains in memory separate equation, format, and window data

for each graphing mode.

parametric   parametric

           parametric

 equation       window

           graph math

  editor

       editor

              menu

To display the parametric equation editor, select 

 from the 

GRAPH

 menu in 

 graphing

mode (6 &). The equation editor menu displayed on the bottom line is the same as the

-mode equation editor menu, except that 

 and 

 replace 

 and 

, and 

 displaces 

.

In this editor, you can enter and display both the x and y
components of up to 99 parametric equations, 

 and 

through 

 and 

, if sufficient memory is available.

Each is defined in terms of the independent variable 

.

Two components, 

 and 

, define a single parametric

equation. You must define both 

 and 

 for each equation.

The default graph style is » (line) in 

 mode. ¾ (shade above) and ¿ (shade below)

graph styles are not available in 

 mode.

Chapter 5 describes these

GRAPH

 menu items:

 and 

.

Chapter 6 describes these

GRAPH

 menu items:

, 

, 

,

, 

, 

,

, and 

.

A common application of
parametric graphs is
graphing equations over time.